BoilerFaultCodes SUMP FAN FAILURE THERMOSTAT High
Boiler Fault Code SUMP FAN FAILURE THERMOSTAT
Also written as SUMPFANFAILURETHERMOSTAT — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code SUMP FAN FAILURE THERMOSTAT appears across 1 boiler brand and 1 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has detected that a safety sensor near the fan or collection area has triggered because it has become too hot or has detected a block. (As reported on Ideal Turbo2 24)
Pick your boiler brand for the SUMP FAN FAILURE THERMOSTAT fix
Source
Information for the SUMP FAN FAILURE THERMOSTAT fault code is sourced from the official service / installation manual for each model that displays it. Read more about how we source fault codes →
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026